Question

Line EF has an equation of a line y = -2x + 7, and line GH has an equation of a line y = x -1. These two lines are

Answer 1

parallel because the slopes of the lines are equal
perpendicular because the slopes are opposite reciprocals
the same line when graphed
intersecting but not at a right angle

Answer 2

perpendicular line have negative reciprocal slope:
parallel line have same slopes

Answer 3

so -2 doesnt equal to 1 and 1 is not a negative reciprocal of -2 then the lines are just interesecting